<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 反转字符串
        var str = 'I Love You';
        var res=str.split('')
        var arr=res.reverse()
        var num=arr.join('')
        console.log(num)
    </script>
</body>
</html>